Shimano Dura-Ace Di2 TT Front Left Derailleur and Brake Lever ST-R9180 ISTR9180L

Shimano Dura-Ace Di2 ST-R9180 TT Hydraulic Disc Brake Shifter Lever – Single Lever Left

Maximum aerodynamics, control, and precision for triathlon and time trial bikes.

Disc brakes are now indispensable in time trials. Higher braking power, better modulation, and safer control provide a significant advantage when you're racing against the clock. The Shimano Dura-Ace Di2 ST-R9180 TT brake/shift levers integrate hydraulic disc brake performance into your cockpit in an aerodynamic and ultra-ergonomic form.

Combining the peak performance of the Dura-Ace series with Di2 technology, the ST-R9180 is compatible with both the 9170 11-speed and 9270 12-speed groupsets (adapter EW-AD305 is required for 12-speed use). Furthermore, thanks to integrated Di2 buttons, it offers flawless gear control in synchronized shifting mode , regardless of aerobar or brake lever position.

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⭐ Key Features

🔥 Optimized design for triathlon and TT bikes .

• Ultra-thin and aerodynamic body

• Fully integrated E-Tube cable routing eliminates cable clutter in the cockpit.

• Clean and friction-free airflow with buttons located inside.

⚙️ Di2 Sensitivity: Electronic Gear Control

• Much faster and more accurate gear changes compared to mechanical systems.

• Control in Synchronized Shift mode with a single button.

• Fast and quick gear changes with Multishift support.

• The buttons are fully programmable.

🛑 Hydraulic Disc Brake Power

• Hydraulic system that operates with mineral oil.

• More powerful, more precise braking.

• Consistent performance even under challenging racing conditions.

• Compatible with BR-R9170 and BR-R9270 brake calipers.

✋ Maximum Ergonomics

• Lightweight and rigid thanks to carbon composite structure.

• Integrated reach adjust

• Secure grip even at high speeds.

• Suitable for handlebar inner diameters of 19.0–22.5 mm.

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📐 Technical Specifications

Usage: Triathlon / TT
Group: Shimano Dura-Ace Di2
Model: ST-R9180
Tip: Schalt- / Bremshebel (Single Lever – Left or Right)
Brake Type: Hydraulic Disc Brake
Material: Carbon Composite
Coordination:

• 2×11

• 2×12 (with EW-AD305 adapter)

Compatible Brake Caliper:

• BR-R9170

• BR-R9270

E-Tube Port: 1 × EW-SD50 (Compatible with SD300 via EW-AD305)
Arm Reach Adjustment: Yes
Handlebar Mounting Inner Diameter: 19.0 – 22.5 mm

Color: Black / Anthracite

Weight (Manufacturer): 99 g
Weight (Actual Measurement): 107 g

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⚙️ Technologies

SEIS – Shimano Electronic Intelligent System

• Intelligent gear management that transfers the SIS-indexed mechanical system to an electronic environment.

• Gear shifting with a single touch of a button.

• 100% accuracy even in cold, muddy, or extremely stressful racing conditions.

• Electronic signal transmission unaffected by dirty or strained cables.

E-Tube Platform

• Plug & Play connectivity system

• Resistant to freezing, oxidation, and stretching.

• Low maintenance requirements

• It can be continuously improved with software updates.

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📦 Box Contents

• 1 x Shimano Dura-Ace ST-R9180 Di2 TT Switch/Break Shifter (Left or Right – depending on your choice)

• 1 Shimano Shift Cable

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🏁 Who is it suitable for?

• Triathletes and TT athletes

• For those who want maximum aerodynamics in time trials.

• Performance-oriented road cyclists switching to the Di2 system.

• Drivers using 9170 or 9270 hydraulic disc sets